Reviewing The Hardware - Comdial DXP Plus Manual

Comdial digital communications system manual

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User manual (80 pages)

Attendant manual (174 pages)

Owner's manual (132 pages)

Table of Contents

3.1 Understanding The Printed-Wire Boards

The basic system consists of a main cabinet, which accepts 14 printed-wire boards, and two expansion

cabinets; the upper expansion cabinet accepts twelve printed-wire boards, and the lower cabinet accepts

eleven (see Figure 7). Some of the printed-wire boards also hold smaller circuit cards that mount

directly to the boards (See section 3.5 for card information) The line boards are listed in section 3.3;

station boards are located in section 3.4. The complement of circuit boards include the following (for

information on the main DXP Plus package, see section 3.6, Locating The Boards):

Auxiliary Board:

A utility board that provides interface for a maximum of four special-purpose circuit cards.

Actual make-up requirements depend upon system configuration.

Central Processing Unit (CPU) Board:

Provides central processing and control for the system and other miscellaneous functions. The

CPU board has the time switch and conference circuitry and two serial data ports, which have

been dedicated for PC-based programming and a remote maintenance modem.

Conference Board:

Provide additional conference capability. Each board provides 5 additional 3-way conferences.

Interface Boards:

Ties the main cabinet to the expansion cabinet. Each expansion cabinet has an interface board;

that connects the main cabinet with the expansion cabinets. Interface boards are included with the

expansion cabinet packages.

Memory Card:

Provides the memory storage and operating system control. The card mounts directly onto the

CPU board, and it is available with two (four megabyte as a future feature) of memory. The

system uses re-programmable random access memory, known as "flash memory" or "flash

RAM" —not replaceable memory chips, known as "EPROM".

Services Board:

Provides an interface for music-on-hold and background music inputs; it also provides an output

to an external paging amplifier. The services board includes four dry-contact relays for external

control functions. You can also add up to three additional cards onto the services board for data

communications, DTMF tone receiving, and E1 or T1 synchronization.

12 – Reviewing The Hardware